I dont know if anyone else has had an issue of this but when I caught this little guy he was the 252nd pet in my collection (Devouring Maggot too :/) and yet he wasn't added to the count. >.< I really hope they fix this soon. Its getting a little iritating.

Rare at 11:22 A.M. Tich US server time. I was about to give up too, I had killed a couple uncommons and a couple commons. The Ancona Chix that come with most of them said not able to capture though. Got mine near the first Twilight Bulwark area, right near where the ramp comes up from the water.

Found one today first try! I flew over to the twilight bulwark at 25,57 and saw a little green paw. When I flew down, the paw went away and I nearly freaked out. When I landed, there it was though. Uncommon quality.

Thanks for all the hints and locations. I went to find this lil guy, and found one on my first try (11:50pm US Nazjatar) it was a poor quality, but had low lvl pets out. Lost the fight, lost the pet. One spawned again within 5 min. but there was a cross-realmer there to steal it from me. Finally, I gave up and started a new character and joined the Warcraftpets guild and then came back and tried again after a couple hours. I found two poor quality iguanas. I caught one in a single night.

I spent several hours farming it in the evening (lots of other folks doing the same) to no avail. Logged on at at 8:30am pacific and the Bulwark was filled with them. Took me about 5 battles to get a rare.

I got a rare between 830 and 845 am server on Zangarmarsh server (probably cross-server). This was in Twilight Bulwark, one of the two Twilight camps along the southern shore of Thousand Needles. It was still dark. I tried many times last night but most were poor quality. This never appeared as a second pet.

There are 2 twilight 'camps' in the lower part of your map called Twilight Bulwark and Twilight Withering that spawns these, I found about 3 or 4 at each camp, didn't check anywhere else in the zone tho. Server time 2:15pm (Eastern)

So I hit the camp at night/early morning and there were a bunch of spawns. Took between 6-8 to find a rare, but all the others were poor quality. For those interested in the time, it was about 4:30 a.m. server. I haven't noticed any respawns.